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What is styled-components?

Learn the basics of writing styles inside JS with styled-components.

What is styled-components?

styled-components embeds styles into JavaScript. You define a component as styled.button\`...\` and write CSS inside.

The result is an isolated component with its own class names; no className clashes. Style and markup live in one place.

This method belongs to the "CSS-in-JS" family; it is powerful for theming and dynamic props. You install the package to use it.

Template syntax

styled-components uses a JavaScript template literal. You write CSS between backticks (`); it is normal CSS syntax.

The result is a React component; you use it as <Btn />. The class name stays stable across renders; isolation is guaranteed.

Later we will send props to this template and make colors dynamic.

Practice Styled button

Complete the skeleton. Create a styled component BlueButton defined with styled.button\`color: blue;\`. Return <BlueButton>Send</BlueButton>. Export it.

Starter code

App.jsx
// Define BlueButton here

Sample solution

App.jsx
const BlueButton = styled.button`color: blue;`;

function App() { return <BlueButton>Send</BlueButton>; }
export default BlueButton;

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 Which family does styled-components belong to?

App.jsx
CSS is written inside a JavaScript file.
  • inline style
  • CSS Modules
  • CSS-in-JS Correct answer
  • global CSS

Explanation: The styled component is defined inside JS.

2 What is styled-components: fill in the missing part

Question 
const Btn = styled.button`____`
Answer 
const Btn = styled.button`color: blue;`

Explanation: You wrote CSS in the template.

3 What is styled-components: match the terms

Term Meaning
styled.button`...` Styled component
`...` Template literal
<Btn /> Usage
CSS-in-JS Family

All lessons in Beginner

1 React intro

  1. What is React?
  2. Setup and Vite
  3. Your first component
  4. Summary - React intro

2 JSX basics

  1. What is JSX?
  2. Expressions and curly braces
  3. Attributes and className
  4. Summary - JSX basics

3 Components

  1. Component logic
  2. Component tree
  3. Naming rules
  4. Summary - Components

4 Profile card

  1. Project: Profile card
  2. Avatar component
  3. Info list
  4. Assemble the card

5 Props

  1. What are props?
  2. Reading props
  3. Children prop
  4. Default props
  5. Summary - Props

6 Conditional rendering

  1. What is conditional rendering?
  2. Ternary operator
  3. Logical AND (&&)
  4. Early return
  5. Summary - Conditional rendering

7 List rendering

  1. What is list rendering?
  2. The key attribute
  3. Array to components
  4. Filtering and sorting
  5. Summary - List rendering

8 Shopping list

  1. Project: Shopping list
  2. Item component
  3. List body
  4. Empty state

9 Events

  1. Events
  2. The event object
  3. Form events
  4. Summary - Events

10 useState

  1. What is state?
  2. The useState call
  3. Updating state
  4. Multiple state values
  5. Summary - useState

11 Counter app

  1. Project: Counter app
  2. Number and buttons
  3. Decrement and reset
  4. Boundary control

12 Forms

  1. Controlled input
  2. Form submission
  3. Multiple fields
  4. Summary - Forms

13 Styling

  1. Styling with CSS
  2. CSS Modules
  3. Inline styles
  4. Summary - Styling

14 styled-components

  1. What is styled-components?
  2. Styling with props
  3. Using themes
  4. Summary - styled-components

15 useReducer

  1. What is useReducer?
  2. Action and state
  3. useState vs useReducer
  4. Summary - useReducer

16 useEffect

  1. What is useEffect?
  2. Dependency array
  3. Cleanup function
  4. Summary - useEffect

17 Context

  1. What is context?
  2. createContext
  3. Provider and useContext
  4. Summary - Context

18 useRef

  1. What is useRef?
  2. DOM access
  3. Timer example
  4. Summary - useRef

19 Todo app

  1. Project: Todo app
  2. Todo entry form
  3. Todo list
  4. Filter and summary

20 Beginner final

  1. Challenge: Weather card
  2. Challenge: Cart summary
  3. Challenge: Counter and reset
  4. Challenge: Dropdown menu